Bump version to 0.4

Author: github-actions[bot]

github-to-wordpress-sync.php

@@ -3,7 +3,7 @@
  * Plugin Name: Github to WordPress Sync
  * Plugin URI: https://sinanisler.com
  * Description: GitHub to WordPress Sync: Streamline theme & plugin updates directly from GitHub. Easy, secure, and developer-friendly.
- * Version: 0.3
+ * Version: 0.4
  * Author: Sinan Isler
  * Author URI: https://sinanisler.com/
  * License: GPL v2 or later